US7687191B2 - Set of electrode plates for rolled electrochemical component and a cell comprising such electrode plates - Google Patents

Set of electrode plates for rolled electrochemical component and a cell comprising such electrode plates Download PDF

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US7687191B2
US7687191B2 US11/019,947 US1994704A US7687191B2 US 7687191 B2 US7687191 B2 US 7687191B2 US 1994704 A US1994704 A US 1994704A US 7687191 B2 US7687191 B2 US 7687191B2
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collecting section
electrode plates
periphery
electrode plate
collecting
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US20050142436A1 (en
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Naoto Arai
Yasushi Hirakawa
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Panasonic Corp
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Panasonic Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/22—Electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/66—Current collectors
    • H01G11/70—Current collectors characterised by their structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/78—Shapes other than plane or cylindrical, e.g. helical
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/13—Energy storage using capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to the rolled electrochemical components such as cells, double-layered capacitors and like, more specifically, to the improvement of the end section of the collector which is connected to the collecting plate.
  • the rolled electrochemical components are widely used in batteries, double-charge-layered capacitors and like.
  • this component has a set of electrode plates which is revolved into a roll and provided with a stripe-shaped separator disposed between a positive electrode plate which is coated with active material on its stripe-shaped collector and a negative electrode plate which is coated with active material on its stripe-shaped collector.
  • the set of electrode plates together with electrolyte is accommodated in a metal casing and protrudes from the collector of the electrode plate of the positive or negative electrode on both upper and lower end faces or one end face of said set of electrode plates.
  • a collecting plate is typically welded on the top end of the collector.
  • splits means that a collector is only cut resulting in a split which has essentially no width or separation; the “notch” means that a collector is partly cut off and a notch is formed which has a broad width) are formed on the collecting section, and a collecting plate is welded on the collecting section with the notches.
  • the collecting section will not be damaged and not be bent to such an extent that the separator would be punched or pricked through (i.e., having a hole formed therein) even though the collecting section is strongly pressed through the collecting plate, so that the possibility of an inner short-circuit can be reduced, and the electrical connection between the collecting section and the collecting plate can be stabilized (see, Japanese Patent Published No. 2000-77054).
  • a thin metal plate is welded on an end section of a collector to form a collecting section with splits formed in an equally-spaced manner, so that there is a problem that the collecting section positioned in the innermost periphery of the set of electrode plate with the smallest radius of curvature which are revolved into a roll can not have a smooth arc-shape but a sharp crimping or crippling, so that the separator may be punched through, thereby the inner short-circuit may occur.
  • the present invention is directed to solve the foregoing technical problem in prior art.
  • the object of the invention is to provide a set of electrode plates for rolled electrochemical components and cells comprising such components, in which there is reliable and stable electrical connection between the collecting section and the collecting plate in the cell and the inner short-circuit may be avoided in the set.
  • a high quality component having reliable and stable electrical connection between the collecting section and the collecting plate thereof is provided, which prevents an inner short-circuit in the set of roll-shaped electrode plates.
  • the object of the invention is to provide a set of electrode plates for rolled electrochemical component and a cell comprising such components, in which there is reliable and stable electrical connection between the collecting section and the collecting plate in the cell so that an inner short-circuit may be avoided in the set of electrode plates.
  • a set of electrode plates for rolled electrochemical component of the invention comprises a stripe-shaped first electrode plate, a stripe-shaped second electrode plate and a stripe-shaped separator, said separator being positioned between the first electrode plate and the second electrode plate, and these three being revolved into a roll in the length direction, wherein said first electrode plate comprises a stripe-shaped first collector and the active material coated on the surface of said first collector and said second electrode plate comprises a stripe-shaped second collector and the active material coated on the surface of said second collector, a first exposed portion with a predetermined width on which the active material is not coated being formed on at least one of two terminals in a width direction of the first electrode plate to constitute a first collecting section, a second exposed portion with a predetermined width on which the active material is not coated being formed on at least one of two terminals in a width direction of the second electrode plate to constitute a second collecting section, characterized in that a structure for preventing sharp crimping is formed on at least one of
  • the structure for preventing sharp crimping is formed on at least one of said first collecting section and said second collecting section in at least the innermost periphery of the set of electrode plates, the resistance on the initial revolved section is small when revolving is started, the revolving can be executed easily around a revolving core rod and the inner short-circuit due to the sharp crimping formed in the collecting section can be prevented.
  • said structure for preventing sharp crimping is formed by cutting off the collecting section which are positioned in at least the innermost periphery.
  • At least 4 splits starting from a side edge of the collecting section in its width direction are formed on the collecting section which is positioned at least in the innermost periphery.
  • the sharp crimping when being revolved, the sharp crimping does not occur on the innermost periphery, so the inner short-circuit due to the sharp crimping formed in the collecting section can be prevented.
  • said structure for preventing sharp crimping is formed by forming at least one notch and at least one strip-shaped collecting section at least in the innermost periphery.
  • the sharp crimping when being revolved, the sharp crimping does not occur on the innermost periphery, so the inner short-circuit due to the sharp crimping formed in the collecting section can be prevented.
  • said structure for preventing sharp crimping is formed by forming at least one notch or at least four splits in at least one of the layers constituting the collecting section at least in the innermost periphery.
  • the sharp crimping when being revolved, the sharp crimping does not occur on the innermost periphery, so the inner short-circuit due to the sharp crimping formed in the collecting section can be prevented.
  • a cell of the present invention comprises: a set of electrode plates, said set of electrode plates comprising a stripe-shaped positive electrode plate, a stripe-shaped negative electrode plate and a stripe-shaped separator, said separator being positioned between the positive electrode plate and the negative electrode plate, and these three being revolved into a roll in the length direction, wherein said positive electrode plate comprises a stripe-shaped positive collector and the active material coated on the surface of said positive collector and said negative electrode plate comprises a stripe-shaped negative collector and the active material coated on the surface of negative second collector, two exposed portions with a predetermined width on which the active material is not coated being formed on at least one of two terminals in a width direction respectively of the positive and negative electrode plates to respectively constitute a positive collecting section and a negative collecting section; a negative collecting plate connected electrically to said negative collecting section; and a positive collecting plate connected electrically to said positive collecting section; characterized in that a structure for preventing sharp crimping is formed on at least one of the positive collecting section and the negative collecting section in at
  • the structure for preventing sharp crimping is formed on at least one of said first collecting section and said second collecting section in at least the innermost periphery of the set of electrode plates, the resistance on the initial revolved section is small when revolving is started, the revolving can be executed easily around a revolving core rod and the inner short-circuit due to the sharp crimping formed in the collecting section can be prevented.
  • FIG. 1 shows a schematic longitudinal cross-section view of a Lithium ion secondary battery of an embodiment of the invention.
  • FIG. 2 shows a diagram of manufacturing procedure of a positive electrode plate of embodiment 1 of the invention.
  • FIG. 3 shows an elevation view of a positive electrode plate of embodiment 2 of the invention, in which a plurality of splits in the direction from an end edge of a collecting section to a shorter side of the electrode plate are formed in the positive electrode plate.
  • FIG. 4 shows an elevation view of a positive electrode plate of embodiment 3 of the invention, in which the positive collecting section is not provided in the section of the positive electrode plate positioned in the innermost periphery of the set of electrode plates, and a plurality of splits in the direction from an end edge of the collecting section to a shorter side of the electrode plate are formed in the positive electrode plate.
  • FIG. 5 shows an elevation view of a positive electrode plate of embodiment 4 of the invention, in which the positive electrode plate is formed, so that a space between two splits abutting each other positioned in the inner periphery of the set of electrode plates is smaller than that positioned elsewhere.
  • FIG. 6 shows a perspective view of a positive electrode plate of embodiment 5 of the invention, in which the positive collecting section is formed into a corrugation perpendicular to the direction of its length.
  • FIG. 7 shows an elevation view of a positive electrode plate of embodiment 6, in which the collecting section is not provided in the outmost periphery of the set of electrode plates.
  • FIG. 8 shows an elevation view of a positive electrode plate of embodiment 7, in which the splits are formed as the spaces of the splits being increased logarithmically from the inner periphery to outer periphery of the set of electrode plates.
  • FIG. 9 shows an elevation view of a positive electrode plate of embodiment 8, in which one or more notches are formed on the innermost periphery of the set of electrode plates.
  • FIG. 1 shows a schematic longitudinal cross-section view of a Lithium ion secondary battery having a size of cylinder 18650 (18 mm in diameter and 65 mm in height).
  • separator 3 made of porous polyethylene film is disposed between positive electrode plate 1 which is coated with active material 1 b on its stripe-shaped positive collector 1 a and negative electrode plate 2 which is coated with active material 2 b on its stripe-shaped negative collector 2 a , the positive and negative electrode plates are revolved into a roll to form set 4 of electrode plates in the state that two electrode plates are placed opposite to each other, and the set 4 of electrode plates together with a liquid electrolyte is accommodated in cell casing 5 .
  • the cell casing 5 consists of a cylinder-shaped cell housing 6 as a negative terminal and a cell cap 7 as a positive terminal.
  • cell housing 6 The upper opening of cell housing 6 is secured to the periphery of cell cap 7 through an insulating sealing pad, thereby cell casing 5 is sealed. Moreover, separator 3 is also provided between the outmost periphery of set 4 of electrode plates and the inner periphery face of cell housing 6 .
  • Positive electrode plate 1 and negative electrode plate 2 have the structure as described specifically below.
  • Positive electrode plate 1 is formed by coating both sides of collector 1 a made of aluminum foil with positive active-substance 1 b , while one end section of positive collector 1 a (upper section in FIG. 1 ) protrudes upward from the section which is coated with positive active-substance 1 b .
  • Positive collecting section 9 shown in FIG. 1 is formed by folding the protruding positive collector 1 a .
  • negative electrode plate 2 has the same structure except that one end section of negative collector 2 a made of copper foil (lower section in FIG. 1 ) protrudes downward from the section which is coated with negative active-substance 2 b.
  • Both end sections of separator 3 protrude upward and downward beyond both end edges of the sections of positive electrode plate 1 or negative electrode plate 2 which is coated with the active material.
  • positive collecting plate 10 is welded to positive collector 1 a
  • negative collecting plate 11 is welded to negative collector 2 a
  • positive collecting plate 10 and negative collecting plate 11 are welded to the inner surface of cell cap 7 and the inner bottom of cell housing 6 respectively.
  • Connecting piece 10 a is provided on positive collecting plate 10 as a wiring piece for connecting collecting plate 10 to the inner surface of cell cap 7 .
  • Connecting piece 11 a is provided in the center section of collecting plate for connecting negative collecting plate 11 to the inner bottom of cell housing 6 .
  • the liquid electrolyte is the solution which is formed, for example, by dissolving LiPF 6 as solute in concentration of 1 mol/dm 3 in the mixed solvent of ethylene carbonate (EC) and (DEC) diethyl carbonate in volume ratio of 1:1.
  • positive electrode plate 10 An exemplary method for manufacturing the electrode plates is now described more specifically below.
  • the procedure is: mixing electrolyzed MnO 2 and Li 2 CO 3 in mixing ratio 1:2, calcining the mixture under temperature of 800 ⁇ in the air for 20 hours to produce LiMn 2 O 4 , mixing LiMn 2 O 4 , acetylene black as a conductor and polyfluorovinylidene as adhesive in weight ratio 92:3:5 to be a mixture as positive active material 1 b , above mixing ratio referring to the ratio between the solid compositions, moreover, dissolving polyfluorovinylidene as adhesive in dissolvent of NMP to make positive active-substance 1 b be in a pasty state, coating both sides of positive collector 1 a with 15 ⁇ m thickness made of aluminum foil with the paste of positive active-substance 1 b to form layers of positive active-substance 1 b in the manner that a lateral edge section with approximately 5 mm width remains without being coated, the layer-thickness on
  • negative electrode plate 2 mixing artificial graphite and sutylen butadiene rubber (SBR) as a binder in weight ratio 97:3 to be a mixture as negative active-substance 2 b , above mixing ratio referring to the ratio between the solid-state compositions, moreover, dissolving SBR as adhesive in dissolvent of water-solvable resolvent to make negative active-substance 2 b be in a pasty state, coating both sides of negative collector 2 a with 14 ⁇ m thickness made of copper foil with the paste of negative active-substance 2 b to form layers of negative active material 2 b in the manner that a lateral edge section with 5 mm width remains without being coated, and then pressing and shaping resulting negative electrode plate 2 to make it have thickness of 170 ⁇ m.
  • SBR sutylen butadiene rubber
  • positive electrode plate 1 and negative electrode plate 2 obtained as described above are placed opposite to each other with separator 3 being sandwiched therebetween and revolved into a roll to form set 4 of electrode plates in the state that positive collecting section 9 and negative collecting section 15 protrude.
  • the lengths of the sections both positive collecting section 9 and negative collecting section 15 protruding respectively from the end section of separator 3 to both sides are approximately 0.5 mm.
  • positive collecting plate 10 is placed on the positive side of set 4 of electrode plates, making it pressed against positive collecting section 9 .
  • Positive collecting plate 10 is ultrasonic-welded with positive collecting section 9 in the state that they are pressed against each other.
  • connecting piece 10 a having approximately 5 mm in width, 0.15 mm in thickness and 70 mm in length is ultrasonic-welded onto positive collecting plate 10 .
  • negative collecting plate 11 is provided on the negative side of set 4 of electrode plates, making it pressed against collecting section 15 of positive electrode. Negative collecting plate 11 is resistance-welded with negative collecting section 15 in the state that they are pressed against each other.
  • Positive electrode plate 1 and negative electrode plate 2 will be described in detail below.
  • Two electrode plates can have a same structure, but can have different structures as well. For easy understanding, the thickness of the electrode plate is showed in magnifying manner.
  • FIG. 2 shows a diagram of a manufacturing procedure of positive electrode plate 1 of embodiment 1.
  • both sides of collector 1 a made of aluminum foil are coated with positive active-substance 1 b to form a stripe-shaped positive electrode plate 1 , a boundary 12 being formed between the end section of the active material and the collector along the length direction.
  • the exposed portion of the collector having a predetermined width protruding from boundary 12 is flexed along a straight line 13 parallel to the boundary, as shown in FIG. 2( b ), and then is folded once to form positive collecting section 9 , as shown in FIG. 2( c ).
  • FIG. 2 shows the structure that the protruding end section of collector 1 a of positive electrode is folded once, but it can be folded several times so long as the respective adjacent collecting sections 9 would not contact with each other when being revolved.
  • collecting section 9 is not provided for the part of collecting section 9 positioned in the innermost periphery of set 4 of electrode plates in the revolving state. More specifically, this can be realized in the manner that, as shown in FIG. 2( a ) ⁇ FIG. 2( c ), the part of positive collecting section 9 positioned in the innermost section is cut off after positive collecting section 9 is formed, alternatively, the part of collector la of positive electrode positioned in the innermost section is cut off in advance.
  • innermost periphery means the periphery of a circle positioned at the innermost portion of the winded set of electrode plates
  • collecting section means a general term for first collecting section, second collecting section or both, or positive collecting section, negative collecting section or both, except a special designation.
  • Positive electrode plate 1 is formed to have the size of approximately 55 mm in width and 570 mm in length.
  • Collector 1 a of positive electrode plate 1 is folded once in above-mentioned method to form positive collecting section 9 of approximately 2.5 mm in width.
  • the cutting process begins at the end edge of positive collecting section 9 which is positioned in the innermost periphery, continues along boundary 12 between the section which is coated with positive active-substance 1 b and the positive collector 1 a , and ends at the point approximately 100 mm away from the end edge, the section therebetween of positive collecting section 9 being cut off.
  • Stripe-shaped negative electrode plate 2 can be formed in the same manner as stripe-shaped positive electrode plate 1 .
  • Negative electrode plate 2 is formed to have the size of approximately 61 mm in width and 600 mm in length. Collector 2 a of negative electrode plate 2 is folded once in the method shown in FIG. 2( c ) to form negative collecting section 15 of approximately 2.5 mm in width.
  • the collecting section is formed by folding once on the end section of the collector, the collecting section will not be damaged and will not be bent to such an extent that the separator would be punched through even though the collecting plate is pressed when being welded, so that the inner short-circuit can be reduced. Moreover, because the collecting section is not flexed greatly, the connection between the collecting sections and the collecting plates are reliable and stable.
  • the collecting section is not provided for the innermost periphery of the set of electrode plates with small radius of curvature when it is revolved into a roll, the resistance on the initial revolved section is small when revolving is started, so that this section can be revolved into a roll around a revolving core rod quickly, thereby the inner short-circuit due to the sharp crimping formed in the collecting section can be prevented.
  • FIG. 3 shows an elevation view of positive electrode plate 1 of embodiment 2.
  • a plurality of splits 14 from an end edge of positive collecting section 9 towards a direction parallel to a shorter side (wideness) of stripe-shaped positive electrode plate 1 are formed on positive collecting section 9 of positive electrode plate 1 , and disposed in the manner that a periphery portion of a circle on inner periphery of the revolved set of electrode plates comprises at least 4 splits and the spaces of splits 14 positioned in the inner periphery of winded set 4 of electrode plates are smaller than those of splits 14 positioned elsewhere.
  • the inner periphery comprises the innermost periphery and the periphery of some circles abutting on the innermost periphery on which the sharp crimping may be caused.
  • the positive collecting section 9 is cut with a cutter from the end edge of positive collecting section 9 towards a direction parallel to a shorter side of stripe-shaped positive electrode plate 1 , that is, to boundary 12 between the section which is coated with positive active-substance 1 b and positive collector 1 a .
  • the spaces of splits 14 are approximately 5 mm in positive collecting section 9 which is positioned in the inner periphery of set 4 of electrode plates, 15 mm in positive collecting section 9 which is positioned in other periphery of set 4 of electrode plates.
  • stripe-shaped negative electrode plate 2 can be formed in the same manner as stripe-shaped positive electrode plate 1 .
  • the collecting section is formed by folding once on the end section of the collector, the collecting section will not be damaged and not be bent to such an extent that the separator would be punched through even though the collecting plate is pressed when being welded, so that the probability of an inner short-circuit can be reduced. Moreover, because the collecting section is not flexed greatly, the connection between the collecting section and the collecting plates is reliable and stable.
  • the resistance on the initial revolved section is small when revolving is started, so that this section can be revolved into a roll around a revolving core rod easily, thereby the inner short-circuit due to the sharp crimping (namely, a sharp angle portion) formed in the collecting section can be prevented.
  • FIG. 4 shows an elevation view of positive electrode plate 1 of embodiment 3.
  • collecting section 9 is not provided for the part of collecting section 9 which is positioned in the innermost periphery of set 4 of electrode plates in revolving state. More specifically, this can be realized in the manner that the part of positive collecting section 9 which is positioned in the innermost periphery is cut off after positive collecting section 9 is formed, alternatively, the part of positive collector la which is positioned in the innermost periphery is cut off in advance. And a plurality of splits 14 in the direction from the end edge of positive collecting section 9 to the shorter side of stripe-shaped positive electrode plate 1 are formed.
  • stripe-shaped negative electrode plate 2 can be formed in the same manner.
  • the collecting section is formed by folding once on the end section of the collector, the collecting section will not be damaged and not be bent to such an extent that the separator would be punched through even though the collecting plate is pressed when being welded, so that the inner short-circuit can be reduced. Moreover, because the collecting section is not flexed greatly, the connection between the collecting section and the collecting plates can be reliable and stable.
  • the collecting section is not provided for the innermost periphery of the set of electrode plates with small radius of curvature when it is revolved into a roll, and a plurality of splits are provided in the collecting section, the resistance on the initial revolved section is small when revolving is started, so that this section can be revolved into a roll around the revolving core rod quickly, thereby the effect of preventing the inner short-circuit due to the sharp crimping formed in the collecting section can be improved.
  • FIG. 5 shows an elevation view of positive electrode plate 1 of embodiment 4.
  • the spaces of splits 14 positioned in the inner periphery of set 4 of electrode plates are smaller than those of splits 14 positioned elsewhere.
  • collecting section 9 is not provided for the part of collecting section 9 which is positioned in the innermost periphery of set 4 of electrode plates in revolving state. More specifically, this can be realized in the manner that the part of positive collecting section 9 which is positioned in the innermost periphery is cut off after positive collecting section 9 is formed, alternatively, the part of collector 1 a of positive electrode which is positioned in the innermost periphery is cut off in advance.
  • stripe-shaped negative electrode plate 2 can be formed in the same manner.
  • the collecting section is not provided for the innermost periphery of the set of electrode plates with the smallest radius of curvature when it is revolved into a roll, and in the inner periphery of the set of electrode plates where the spaces of the splits provided in the collecting section in the revolving state are smaller than those in other section, resistance on the initial revolved section is decreased to a minimum when revolving is started, so that this section can be revolved into a roll easily, thereby the inner short-circuit due to the sharp crimping formed in the collecting section can be prevented.
  • FIG. 6 shows an elevation view of positive electrode plate 1 of embodiment 5.
  • a corrugation perpendicular to the direction of its length is formed on positive collecting section 9 plate 1 . More specifically, the corrugation can be formed by clamping and pressing positive collecting section 9 using corrugation-shaped mould.
  • stripe-shaped negative electrode plate 2 can be formed in the same manner.
  • the mechanical strength of the collecting section can be further increased with the aid of the corrugation, and the effect of preventing the inner short-circuit due to the flex of the collecting section is improved.
  • FIG. 7 shows a perspective view of positive electrode plate 1 of embodiment 6.
  • positive collecting section 9 is not provided for the part of positive collecting section 9 which is positioned in the outermost periphery of set 4 of electrode plates in revolving state as shown in FIG. 2( d ), FIG. 3 , FIG. 4 and FIG. 5 . More specifically, this can be realized in the manner that the part of positive collecting section 9 which is positioned in the innermost periphery is cut off after positive collecting section 9 is formed as shown in FIG. 2( a ) ⁇ ( c ), alternatively, the part of collector 1 a of positive electrode which is positioned in the innermost periphery is cut off in advance, as shown in FIG. 7( a ) to FIG. 7( d ) respectively.
  • the cutting process begins at the end edge of positive collecting section 9 which is positioned in the outermost periphery, continues along boundary 12 between the section which is coated with positive active-substance 1 b and positive collector 1 a , and ends at the point 70 mm away from the end edge, the section therebetween of positive collecting section 9 being cut off.
  • stripe-shaped negative electrode plate 2 can be formed in the same manner.
  • the collecting section in the outmost periphery of the set of electrode plates will be not hanged on the opening of the casing, so that the set of electrode plates can be inserted in the casing easily because the collecting section is not provided for the outmost periphery of the set of electrode plates, the efficiency of production and the quality being able to be increased.
  • FIG. 8 is an elevation view showing positive electrode plate 1 in embodiment 7.
  • a plurality of splits 14 from an end edge of positive collecting section 9 towards a direction parallel to a shorter side (wideness) of stripe-shaped positive electrode plate 1 are formed on positive collecting section 9 of positive electrode plate 1 , and disposed in the manner that a space of two splits 14 abutting each other on positive collecting section 9 is logarithmically increased from inner periphery to outer periphery of winded set 4 of electrode plates.
  • positive collecting section 9 is cut with a cutter from the end edge of positive collecting section 9 towards a direction parallel to a shorter side of stripe-shaped positive electrode plate 1 , that is, towards boundary 12 between the section which is coated with positive active-substance 1 b and positive collector 1 a , to form a plurality of splits 14 .
  • the positive collecting section 9 is cut in the inner periphery of set 4 of electrode plates, in which the portions of spaces being respectively 5 mm, 7 mm and 10 mm between two splits 14 abutting each other are cut respectively 10 times, and last, the positive collecting section 9 is cut 8 times in the outer periphery of set 4 of electrode plates, in which a space between two splits abutting each other is 25 mm.
  • stripe-shaped negative electrode plate 2 can be formed in the same manner as stripe-shaped positive electrode plate 1 .
  • FIG. 9 is an elevation view showing positive electrode plate 1 in embodiment 8.
  • a notch 16 from an end edge of positive collecting section 9 towards a direction parallel to a shorter side (wideness) of stripe-shaped positive electrode plate 1 is formed from a location of approximately 5 mm apart from the inner side at the wideness direction of positive collecting section 9 at the innermost periphery, having a space of 15 mm.
  • the inner periphery of approximately 5 mm forms a strip-shaped collecting section 17 .
  • positive collecting section 9 is cut and cut off a part with a cutter from the end edge at the length direction of positive collecting section 9 towards a direction parallel to a shorter side of stripe-shaped positive electrode plate 1 , that is, towards boundary 12 between the section which is coated with positive active-substance 1 b and positive collector 1 a , to form notch 16 .
  • one notch 16 is provided on the innermost periphery, however a plurality of notches 16 may be provided on the innermost periphery.
  • the notches provided on the other periphery except the innermost periphery may be splits, or splits and notches.
  • stripe-shaped negative electrode plate 2 can be formed in the same manner as stripe-shaped positive electrode plate 1 .
  • positive collecting section 9 and negative collecting section 15 are formed in the whole set of electrode plates from its innermost periphery to its outermost periphery without splits 14 formed in positive electrode plate 1 and negative electrode plate 2 .
  • Positive collecting section 9 and negative collecting section 15 are welded onto positive collecting plate 10 and negative collecting plate 11 respectively.
  • the subsequent manufacturing procedures are the same as that of the embodiments. 100 cells like this are prepared.
  • Fall-impact tests were performed for each 100 cells of the embodiment and comparing examples 1, 2 respectively.
  • the falling height is 75 cm, and falling down of a cell thrice each for a state of the cell that is in an upright, an upside down and a horizontal direction respectively is one cycle.
  • the open-circuit voltages of a cell are measured to judge whether the inner short-circuit between the opposite electrode plates occurs, which results from pricking the seperator through due to the sharp crimping formed in the positive collecting section 9 or the collecting section of negative electrode.
  • the inner short-circuit occurs when the open-circuit voltage of a cell drops, and the number of the cycles in which the open-circuit voltage of a cell drops can be compared and evaluated.
  • the position where the inner short-circuit occurs can be confirmed by disassembling and analyzing the cell, and only the cells in which the inner short-circuits between the opposite electrode plates occur, which result from pricking the separators through due to the sharp crimping formed in the collecting sections of positive electrodes or the collecting sections of negative electrodes, can be counted.
  • the open-circuit voltages of the cells of embodiments 1-8 which obtain the same results begin to drop after 70 cycles.
  • the open-circuit voltages of the cells of comparing examples 1 begin to drop after 40 cycles
  • the open-circuit voltages of the cells of comparing examples 2 begin to drop after 30 cycles. It can be considered that the cells of the embodiment have better structure than that of the comparing ones, so that the inner short-circuits between the positive collecting section 9 and the collecting section of negative electrode are suppressed.
  • the collecting sections positioned in the innermost peripheries with the smallest radii of curvature of the sets of electrode plates which are revolved into rolls have sharp crimping, so that the separators may be punched through by the crimping, thereby the inner short-circuits may occur.
  • the collecting sections are not provided for the innermost peripheries of the sets of electrode plates with the smallest radii of curvature when they are revolved into rolls, so that the inner short-circuits can be suppressed.
  • the times of folding the end section of the collector can be more than one so long as the final thickness of the collecting section is smaller than that of the electrode plates.
  • said folding times can be determined according to the thickness of the collector itself, it is preferred that the folding times are 1 ⁇ 5.
  • the same effect can be obtained using the collecting section formed by folding the end section of the collector several times.
  • the positive collector made of aluminum foil is folded 3 times, and the negative collector made of copper foil is folded 2 times.
  • a collecting section may be formed directly by the collector not being folded.
  • Lithium ion cell While what described above is a Lithium ion cell, the same effect can be obtained for the electrical components such as cells other than Lithium ion cells, double-layered capacitors and like.
  • the rolled electrochemical components such as cells, double-charge-layered capacitors and like in which the positive electrode plate and the negative electrode plate are revolved into a roll with a separator being sandwiched therebetween, and the collectors are incorporated with the collecting plates. Furthermore the end sections of the collectors connected with the collecting plates are improved, so that the rolled electrochemical components with high quality can be provided.

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JP4952123B2 (ja) * 2005-12-13 2012-06-13 パナソニック株式会社 コンデンサユニット
US20080026288A1 (en) * 2006-07-26 2008-01-31 Eveready Battery Company, Inc. Electrochemical cell with positive container
US20080026293A1 (en) * 2006-07-26 2008-01-31 Eveready Battery Company, Inc. Lithium-iron disulfide cylindrical cell with modified positive electrode
US20100273036A1 (en) * 2006-10-17 2010-10-28 Eveready Battery Company, Inc. Lithium-Iron Disulfide Cell Design with Core Reinforcement
JP4208007B2 (ja) * 2006-11-15 2009-01-14 トヨタ自動車株式会社 集電体の製造方法及び蓄電装置の製造方法
FR2921195B1 (fr) * 2007-09-13 2009-11-06 Batscap Sa Procede et dispositif pour la fabrication d'ensambles de stockage d'energie electrique
US7983021B2 (en) * 2007-10-31 2011-07-19 Corning Incorporated Oblong electrochemical double layer capacitor
JP4964350B2 (ja) * 2009-04-28 2012-06-27 太陽誘電株式会社 電気化学デバイスおよびその製造方法
KR101147237B1 (ko) 2010-07-12 2012-05-18 삼성에스디아이 주식회사 전극조립체 및 이를 포함하는 이차 전지
JP5757414B2 (ja) * 2010-08-18 2015-07-29 株式会社Ｇｓユアサ 電池用電極シート及びその製造方法
WO2015198526A1 (ja) * 2014-06-26 2015-12-30 パナソニックＩｐマネジメント株式会社 捲回型電池
DE102015218533A1 (de) * 2015-09-28 2017-03-30 Robert Bosch Gmbh Verfahren zur Herstellung eines Elektrodenverbundes
FR3052917B1 (fr) * 2016-06-15 2022-03-25 Commissariat Energie Atomique Electrode pour faisceau electrochimique d'un accumulateur metal-ion ou d'un supercondensateur, procede de realisation du faisceau et de l'accumulateur associes
KR102065363B1 (ko) * 2016-07-04 2020-01-13 주식회사 엘지화학 전극 및 그 전극의 제조방법 및 그 전극의 제조를 위한 롤러
CN117854938A (zh) * 2017-06-30 2024-04-09 京瓷Avx组件公司 用于超级电容器的电极组件
CN111937187B (zh) 2018-04-06 2023-04-18 三洋电机株式会社 圆筒形电池
CN114824413A (zh) 2021-01-19 2022-07-29 株式会社Lg新能源 电池及应用于电池的集电体、包括集电体的电池组及汽车

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